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Old 26th March 2010, 07:46 AM   #11
Cristi is offline Cristi  Europe
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the standard speaker protection module can be powered with AC voltage in range of 10-12V AC or DC voltage of 11-15V DC. for DC, the AC1 and V+ must be connected together. the power consumption is very low, below 1W and doesn't require a separate transformer unless there is no AC or DC suitable voltage available.
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Old 3rd April 2010, 12:29 PM   #12
sendler is offline sendler  United States
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Default Speaker protection for bridged amp with 15vdc on each leg

I am trying to implement speaker protection for a bridged amp with single 30v supply that always has +15vdc between each leg of the output and ground, 0v between the legs. I believe that I can use a pair of resistors in series across the outputs and sense for dc from their center tap to either speaker terminal if I use a separate transformer to power your protection module and don't correlate the grounds between it and the amp. Do you have a link to the circuit for the protection module? Do you also sell a cheap 110v transformer to go with the module?
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Old 6th April 2010, 03:08 AM   #13
sendler is offline sendler  United States
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Default Try it

Quote:
Originally Posted by sendler View Post
I am trying to implement speaker protection for a bridged amp with single 30v supply that always has +15vdc between each leg of the output and ground, 0v between the legs. I believe that I can use a pair of resistors in series across the outputs and sense for dc from their center tap to either speaker terminal if I use a separate transformer to power your protection module and don't correlate the grounds between it and the amp. Do you have a link to the circuit for the protection module? Do you also sell a cheap 110v transformer to go with the module?
I guess I'll just have to try it to find out if it will work.
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Old 7th April 2010, 04:46 AM   #14
Cristi is offline Cristi  Europe
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sorry for late reply, i just came back after Easter Holiday, i had no internet where i was....
to use the speaker protection circuit for a BTL connected amplifier, the reference voltage (the floating GND which can be disconnected from the backside of the board) must be biased with a DC voltage equal to the output voltage with no input signal. if the amplifier is supplied at 30V DC, the outputs will have about 15V at idle. the GND reference of the speaker protection must be connected with a resistor divider between 30V and GND, and the amplifier supply voltage must be isolated from the speaker protection module supply voltage, with a small transformer or a separate transformer winding. i can provide you the transformer as well.
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Old 7th April 2010, 11:00 AM   #15
sendler is offline sendler  United States
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Default Transformer

Quote:
Originally Posted by Cristi View Post
sorry for late reply, i just came back after Easter Holiday, i had no internet where i was....
to use the speaker protection circuit for a BTL connected amplifier, the reference voltage (the floating GND which can be disconnected from the backside of the board) must be biased with a DC voltage equal to the output voltage with no input signal. if the amplifier is supplied at 30V DC, the outputs will have about 15V at idle. the GND reference of the speaker protection must be connected with a resistor divider between 30V and GND, and the amplifier supply voltage must be isolated from the speaker protection module supply voltage, with a small transformer or a separate transformer winding. i can provide you the transformer as well.
What voltage does the speaker protection module require?
Your site doesn't catalog any transformers. Do you have a part number for a small 110v transformer for the protection module? .2 amp? .1 amp? How do I add it to my shopping cart?
Can I just power it from the 32vdc supply of the amp with a divider center tapped to supply the reference and ground for the module? Will it tend to turn off and open the relay before the amps turn off pop? Or at the same time as the pop possibly letting some through?
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Last edited by sendler; 7th April 2010 at 11:17 AM.
 
Old 8th April 2010, 03:39 AM   #16
Cristi is offline Cristi  Europe
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the default supply voltage is 12V (11-14V) on request, 24V relay can be used which can work up to 30V with series resistor which is already placed on the board.
for transformer and other details you can contact me by mail.
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Old 10th April 2010, 02:30 PM   #17
sendler is offline sendler  United States
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Default I found a transformer

Quote:
Originally Posted by Cristi View Post
the default supply voltage is 12V (11-14V) on request, 24V relay can be used which can work up to 30V with series resistor which is already placed on the board.
for transformer and other details you can contact me by mail.
I will just use these 115/9v transformers from digikey.
Thanks
.
Digi-Key - 567-1035-5-ND (Manufacturer - BV030-7329.0)
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Old 12th April 2010, 03:46 AM   #18
Cristi is offline Cristi  Europe
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this transformer looks fine. as long as the idle rectified and filtered voltage will not be > 15V DC and the voltage with load (relay closed) will not be below 11V, it will work fine.
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Old 13th April 2010, 01:09 AM   #19
kp93300 is offline kp93300  Malaysia
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Default power supply for speaker protection module,

Quote:
Originally Posted by Cristi View Post
the standard speaker protection module can be powered with AC voltage in range of 10-12V AC or DC voltage of 11-15V DC. for DC, the AC1 and V+ must be connected together. the power consumption is very low, below 1W and doesn't require a separate transformer unless there is no AC or DC suitable voltage available.
I want to use dc . I want to check the power input wiring.


0v DC tied to the ground
12V + dc tied to ac1 and V+

Is this correct? Have you got a schematic ?
thanks

kp93300
 
Old 13th April 2010, 04:11 AM   #20
Cristi is offline Cristi  Europe
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Quote:
Originally Posted by kp93300 View Post
I want to use dc.
0v DC tied to the ground
12V + dc tied to ac1 and V+
Correct.
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